Carburetor



lll

. EDWARD a. Yao, on PEARL RIVER, new Yoan.

caaauianfron..

Application lerl March 29, 1927. Serial No. 179,370.

My invention relates to carbin'etors for internal' combustion enginesand has `for its object to provide a device of this character designedto more eliiciently vaporize the fuel before supplying the sam-e to theengine; to eliminate the so-called fiat-spot commonly occurring inmotors at the beginning of the period of sudden acceleration due to 'themomentaryv unbalancing of the fuel mixture; to provide means formedintegrally with the carburetor adapted to supply a primary charge offuel to the motor before the same kis started and to control the flow offuel in proportion to the air by a valve mechanism actuated by themovements of the control throttle. v

A further object resides in the assembly of the various working parts ina neat and compact manner `and 'protectingthe fuel chamber'from theadmission of dirt ard dust, to limit the construction to few workingparts and arrange the same in an efficient operating relation andthereby to reduce the cost of manufacture to a minimum.

@ther objects and 'advantages .reside in the construction, combinationand arrangement of the Various elements forming the invention as morefully hereinafter described and claimed, reference being had to theaccompanying drawing forming part hereof, wherein like numerals `referto like parts throughout the specification and in which Figure l is aperspective view showing' the exterior design of the device,

.Figure 2 is ab vertical longitudinal .sectional view, and

Figure 3 is a detailed perspective view of the tubular air controlvalve.

Referring now to the drawing wherein for the purpose of illustration Ihave shown ay lnfeferred form of my invention, l provide a `carburetorbowl 5, preferably cup-shaped, and having a cover plaie (i fittedthereover and from the center of which a fuel feed tube i" is suspendedwithin the howl with .its lower end spaced slightly above the bottomthere.- of. An annular float 8 is arranged iu the bowl, to which isattached one end of a pivotally mounted arm 9 extending laterally of thebowl and' having its opposite end con nected with a valve 10 adapted toseat within the fuel feed passage formed at one side of the bowl andcommunicating with the intake pipe 11 leading to the supply tank,thereby providing for maintaining a proper amount of fuel in the bowl.

. with a knurled head 25.

Upon the cover plate t3 l provide a block 1Q, which may be of anysuitable shape and having a. bore extending horizontally therethroughwithin which is lslidnibly fitted an elongated tubular air control valvestem 1? extending' outwardly from the block at each end. At Yone end ofthe stem is formedv a tapered head 14 adapted to have its sides seatinto and close a reduced neck 15 of an air intake 1:6 which is formedintegrally with-the cover plate 6l and constitutes an extension thereon,the en d of the head extending beyond the closed neck. The necked endofthe air intake is connected with the intake manifold pipe 17 of theengine and the opposite end is open and of sutliciently increaseddiameter to Apermit the .circulation of air entirely aronndthesteni 13and head 14.

The stem and head have a bore 18 extending longitudinally therethroughwithin which is arranged a fuel adjusting` valve stem 19 having a head20 adapted to close the end of the bore 18 extending beyond the closedneck and the opposite end of the valve stem 19 is provided with anadjusting screw 21' formed integrally therewith.

The tube is provided with zin-extension 22 lea-ding upwardly through thebase of the block 12 and communicating with the bore 1.8 through alongitudinal slot 23, the slot permitting` the limited sliding movementof the stem 13 with respect 'to the tube extension.

A needle valve 24 is arranged in the end of the extension 22, andprotrudes laterally of the block where its outer end is provided N earthe outer end of the needle valve is arranged a collar 25 to which isattached one end of a pivotallymounted arm 26 having its opposite endcontacting witlra cam 27 formed on a lever Q8 to which the throttlecontrol rod 29 is attached. A coil spring 30 is mounted on the upper endof the needle valve 245e and seated in .a recess 30 formed in the blockwith the upper end of the i-'} 1in.g abut ting the collar Q5 andoperating to open the needle valve with the opening of the throttle. Thecam 2T carried on. the throttle lever and engaging the. arm 26 operates4to close the needle valve with the closing of the throttle.

At one edge of the lever 28 is formed a yoke 31 engaging a pin 32carried on the end of the stem 13 opposite from the head 14, so that themovement of the throttle will cause the longitudinal sliding of the stem13 thus moving the head la into and out of seated position in the neckof the air intake.

Upon one side of the stem 13 I provide a small disk 33 constituting aplunger adapted to be slidably arranged in a cylinder 34 formed in theblock 12, the cylinder having an air openinp'. An air passage extendsfrom the cylinder to a hollow rib 36 formed on the wall ot' the bowl 54and opening into the bowl immediately beneath the lower end ot the tube7. Thus the sliding movement of the stem 13 will operate to move theplunge in the cylinder thereby forming an air compression in the passageand forcing` the fuel upwardly in the tube 7 and into the bore 1Sleading to the intake manifold. It is obvious that'the throttle may beopened and closed before the engine has been started and by so doingl apriming charge of fuel is forced into the engine thereby enabling theinstant starting` of the same as soon as the ignition is turned on.

I claim: y

l. A carburetor comprising a fuel bowl andan air intake, a slidablymounted valve for said intake with a head at one end for controllingcommunication through the intake and having a bore exitending`therethrough with an outlet beyond the head ot end of the intake and astem 'formed there.4

on, said head and stem having a bore extending` therethrough. a blockcarried on the bowl tor sli-dably supporting the stem, a fuel feed tubeconnecting the bowl and the bore, a valve arranged in said tube, acylinder tori-.ned in said block, a plunger carried by the stein andoperatively arranged in the cylinder andiactuated by the movement ot thestem, a hollow rib formed on the bowl and effecting' communicationbetween the cylinder and the tube and a control lever onerativelyattached to the stem and the tube valve tor the simultaneous movementthereof.

In testimony whereof I ailix my signature.

EDVARD J. YEO.

